patch 8.1.0019: error when defining a Lambda with index of a function result commit https://github.com/vim/vim/commit/b4518563c73460150344a57879bf5b22cb8b1c77 Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 22 18:31:35 2018 +0200 patch 8.1.0019: error when defining a Lambda with index of a function result Problem: Error when defining a Lambda with index of a function result. Solution: When not evaluating an expression and skipping a function call, set the return value to VAR_UNKNOWN.

the first target to make vim is: reconfig
srcdir = .
VIMNAME = vim
EXNAME = ex
VIEWNAME = view